OIAs of muscles that act on humerus- moves glenohumeral joint

Pectoralis major origin

clavicle, sternum, and the costal cartilages of the upper ribs

Pectoralis major insertion

greater tubercle of humerus

pectoralis major action

flexes, adducts, and medially rotates arm (GH joint)

latissimus dorsi action

extends, adducts, and medially rotates arm (GH joint)

deltoid origin

clavicle, acromion process, and spine of scapula

deltoid insertion

deltoid tuberosity of humerus

deltoid action

abducts, flexes and extends medially and laterally rotates arm

supraspinatus origin

supraspinous fossa of scapula

supraspinatus insertion

greater tubercle of humerus

supraspinatus action

abducts arm and stabilizes glenohumerol joint

infraspinatus origin

infraspinous fossa of scapula

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

laterally rotates arm and stabilizes glenohumeral joint

subscapularis origin

subscapular fossa of scapula

subscapularis insertion

lesser tubercle of humerus

subscapularis action

medially rotates arm and stabilizes glenohumeral joint

teres minor origin

axillary border of scapula

teres minor insertion

greater tubercle of humerus

teres minor action

laterally rotates and adducts arm and stabilizes glenohumeral joint

teres major origin

inferior angle of scapula

teres major insertion

intertubercular groove of humerus

teres major action

adducts, extends and medially roates arm

coracobrachialis origin

coracoid process of scapula

coracobrachialis insertion

medial surface of humerus

coracobrachialis action

flexes and adducts the arm